NFC Receiver Sampling Phase Control Under Wireless Charging Load
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Solution Overview
Problem
NFC devices face challenges in maintaining the operation point of the receiver within its dynamic range during wireless charging due to loading effects, leading to communication failures, especially in close coupling scenarios, where conventional regulation mechanisms are too slow to counteract the drift caused by loading effects.
Innovation Solution
An NFC device with a clipping detector and a sampling phase controller adjusts the sampling phase of the receiver based on detected clipping of the analog-to-digital converter signals, using predefined rules to keep the operation point within the dynamic range without complex optimization or significant sensitivity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional regulation mechanisms are used to maintain the operation point, then the system structure remains simple, but the regulation speed is too slow to counteract loading effects in close coupling scenarios
Solution Approach 1:
The patent implements dynamic adjustment of the receiver operation point by detecting clipping conditions and automatically adjusting the sampling phase or gain. This dynamic mechanism allows the system to rapidly respond to loading effects in close coupling scenarios, transforming the static operation point into an adaptive one that can follow signal variations in real-time.
Solution Approach 2:
The patent introduces a feedback mechanism where the clipping detector monitors the receiver output and provides information to the operation point adjuster. This closed-loop feedback enables the system to detect when loading effects cause clipping and automatically correct the operation point, achieving fast regulation without requiring complex open-loop control systems.
2Reliability
If the receiver operation point drifts due to loading effects, then communication reliability deteriorates, but adjusting the operation point requires complex optimization mechanisms
Solution Approach 1:
The patent enables the receiver to self-correct its operation point by detecting clipping conditions internally and automatically adjusting its own parameters. The clipping detector and operation point adjuster work together to allow the receiver to maintain optimal performance without external intervention or complex optimization algorithms, achieving reliable communication through self-regulation.
Solution Approach 2:
The patent changes the receiver operation parameters (sampling phase or gain) based on detected clipping conditions. By dynamically adjusting these parameters in response to loading effects, the system maintains the operation point within the optimal dynamic range, ensuring reliable communication without requiring complex optimization mechanisms.
3Reliability
If the sampling phase is frequently adjusted to maintain dynamic range, then communication stability improves, but the time required for adjustment increases
Solution Approach 1:
The patent performs preliminary detection of clipping conditions during the reception of data frames. By detecting clipping early in the reception process, the system can prepare adjustment parameters in advance and apply them during idle periods between frames, minimizing the actual adjustment time and maintaining communication stability without significant time loss.
Solution Approach 2:
The patent adjusts the sampling phase periodically between data frame receptions rather than continuously during reception. This periodic adjustment approach allows the system to maintain stability during critical reception periods while making necessary adjustments during idle intervals, balancing communication stability with adjustment time requirements.
Data Source
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AI summary
In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: a receiver, said receiver including an analog-to-digital converter; a clipping detector configured to detect clipping of one or more signals processed by the analog-to-digital converter; and a sampling phase controller operatively coupled to the clipping detector, wherein said sampling phase controller is configured to adjust a sampling phase of the receiver based on an output of the clipping detector. In accordance with a second aspect of the present disclosure, a method of operating a near field communication (NFC) device is conceived.